Auth bypass in Elastic Kibana
CVE-2026-78603
Missing Authorization (CWE-862) in Kibana can lead to information disclosure via Exploiting Incorrectly Configured Access Control Security Levels (CAPEC-180). An authenticated user holding minimal Elasticsearch privileges could bypass Kibana feature authorization and space access controls, resulting in the unauthorized disclosure of Fleet deployment metadata from the default Kibana space.
Vulnerability class: Broken Access Control
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
Affected products
- Elastic Kibana — versions 9.5.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-78603?
- CVE-2026-78603 is a medium-severity vulnerability in Elastic Kibana, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-09-01.
- How severe is CVE-2026-78603?
- Medium severity. CVSS v3 base score is 4.3 out of 10.